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Fair Value Measurements - Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments (Details) $ in Thousands | Sep. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Estimated Fair Value | $ 2,022,605 | $ 2,411,622
Trading investments | 54,840 | $ 54,481
Level 3 | Valuation Technique, Discounted Cash Flow |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Estimated Fair Value | 2,910 |
Trading investments | 54,840 |
Total | $ 57,750 |
Level 3 | Valuation Technique, Discounted Cash Flow | Minimum | Measurement Input, Prepayment Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt Securities | 0.071 |
Residual Interests | 0.071 |
Level 3 | Valuation Technique, Discounted Cash Flow | Minimum | Measurement Input, Default Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt Securities | 0.040 |
Residual Interests | 0.040 |
Level 3 | Valuation Technique, Discounted Cash Flow | Maximum | Measurement Input, Prepayment Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt Securities | 0.111 |
Residual Interests | 0.111 |
Level 3 | Valuation Technique, Discounted Cash Flow | Maximum | Measurement Input, Default Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt Securities | 0.170 |
Residual Interests | 0.170 |
Level 3 | Valuation Technique, Discounted Cash Flow | Weighted Average | Measurement Input, Prepayment Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt Securities | 0.085 |
Residual Interests | 0.085 |
Level 3 | Valuation Technique, Discounted Cash Flow | Weighted Average | Measurement Input, Default Rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Debt Securities | 0.115 |
Residual Interests | 0.115 |

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